Rotary pump



VV. 1. PlATT.

VROTARY PUMP.

Feb. 6, 1923.

FILED NOV. l, 1920.

, h/w. TEF JZ lifetented Feb., d, 31.@23,

WALTER r. MATT, or oenrnisn, 'camronma ROTARY PUMP.

appupation mea november i, ma. serial' no. 420,967.

To all lw/'tom 15mg cof/wem:

Be it known that l, WALTER J. PIATT, a citizen of the UnitedY States,and resident of the city of Oakland, county of Alameda, State ofCalifornia, have invented certain new and useful improvements in RotaryPumps, of which the following is a speelfication. f My invention relatesto improvements in pumps, and more particularly to pumpsof thatcharacter wherein a rotor, equipped With a plurality of vradiallymovable blades, is mounted eccentrically within a cylindrical casing andmeans is provided for actuating the blades to maintain pockets intowhich water is drawn and discharged as the rotor revolves.

. 4The" principal object of the invention 1s to improve upon pumps ofthis or similar types by the provision of means whereby the pump willYautomatically clean itself of sand and gravel carried in with the water,whereby friction and wear on the moving parts 1s reduced to a minimum,and which makes possible the construction of a durable, efficient andeconomical pump ata relatively small cost.

ln accomplishing these and other objects of vthe invention l havelprovided the improved details yof constructlon, the preferred forms ofwhich are illustrated in the accompanying drawings, wherein- Figure 1 isa sectional view, taken transversely of the rotor shaft, through a pumpconstructed in accordancewith the present invention.

Figure 2 isa half section of the same, taken longitudinally of the rotorshaft.

Figure 3 is a perspective view of a rotor, a balancing ring and a sandring or bushin gthe parts'being shownin disassembled re ation.

- Figure l is aface view of an alternative type of balancing ring havlngan open base portion. l v l Fi re 5 is a transverse section taken on thel1ne 5--5 in Figure d.

'According y, l have provided t native type of balancing ring providedwith stops for each ofthe rotor blades.

Referring more in detail to the several views of the drawings, whereinlike reference numerals designate the same or like partse y i ldesignates a cylindrical pump casing, which is closed at its oppositeends by end plates, as shown at 2; the latter being secured to thecasing by means of bolts 3 extended through the periphery of theplatesand through flanges 4 formed on the casing ends, in such manner asto form a watertight joint.

Extending revolubly through the casing is a rotor drive shaft 5. rllhisis'supported ec- Icentrically above the axial line of the casing withinsuitably packed bearings, as at 6, in the end plates 2, and has a rotor7 keyed thereon which is of such diameter that at one side, at the point8 in Figurel, it will revolve closely yadjacent or in engagement withthe casing wall. ln the present construction, the space between therotor and the casing, following in the direction of rotation of therotor, gradually increases from the top of the casin to the bottom sidethereof, andthen gra vually decreases. This condition provides thatwater taken in at one side of the casing and driven forwardly by 'therotorblades, as'presently described, will be ueezed out at the oppositeside. e casing, at one side, with' an inlet opening 9 and atthe oppositeside with an outlet channel l0 which extends in open communication withthe interior of the casing from near the bot tom thereof to adjacent thepoint of contact of the rotor and casing at the top, where it opens intoa discharge spout l1. Suitable connections may be made with the inletand the outlet openings to lead the water respectively from a source ofsupply to the pum and then Ato the point of discharge.

W ile l have not shown means for actuating the rotor shaft, it is aparent that this may be done in any desir-ab e manner, preferably bymeans of a belt operated over a belt wheel mounted on the rotor shaftexteriorly of the casing.

` rfhe rotor 7 is provided at equally spaced intervals circumferentiallywith radially directed slots 12, and fitting slidably therein are blades13, of the same length as the rotor and provided at their inner cornersat their ends with projecting lugs 14 that extend within circularlyformed grooves 15 concentrically located within balancing rings 16 thatare revolublycontained 'within guide grooves 17 formed concentricallywithin the inner faces of the end walls 2.

The balancing rings 16 are mounted to revolve within bushing rings 18that are fitted within the grooves 17, so that continuous frictioncaused by the rotation of the rings 16 will not cause wear on-the endplates but will be taken by these bushing rings which can be moreconveniently replaced.

In order that the bushing rings employed may clean fthemselves of sandthat may be washed intothe pump with the water, I have provided the baseportions 18 ofthese bushing rings with inwardly facing channels 20 andhave provided the base portions 16 of the rings 16 with apertures 21which are adapted to follow in registration with the channels so that acirculation of water between the bushing rings and balancing rings isprovided and which will wash out such sand and gravel thatmay collecttherein and provide a film of water between these parts that will makeoperation easy.

The disposition of the rings 16 within the casing ends is such that asthe rotor revolves, the blades will be actuated radially within theslots 12 in such manner that their outer edges will at all times justnicely clear the casing walls, leaving onl enough space for a water filmthat will su stantially prevent leakage.

To prevent excessive wearo'n the actuating lugs 14 of the blades, suchas would result if they should have constant rubbing contact with thebalancing rings, I have provided these rings at one side with twoclosely spaced apart stops 25 and 25 as shown in Figure 3, between whichthe end lug 14 of one of the blades may be extended so that, as therotor revolves, the balancing rings will likewise be revolved and norelative movement of the rings and blades will take place, but theblades .will be actuated .radially, within the rotor slots, to maintaintheir position adjacent the casing wall. This construction provides forthe distribution of wear and pressure over a maximum area and places iton the ring parts that can be readily and chea ly replaced.

In Figures 4 an 5 I have4 illustrated a balancing ring of an alternativetype of construction, wherein the base portion is mostly cut awayleaving. large openings 28 to provide for a free and easy flow of waterwithin the sand groove of a bushing wherein the ring may be mounted. Inrings of this type bushing ring provided is not equipped with the sandchannel. The feature of this ring is that it has a raised annular baseportion 29 `forming an annular channel 30 which provides for the flow ofwater beneath the same in the same manner as is provided for inv thepreviously described construction. Another feature of this ring is thatit may be `die stamped and is of cheaper construction than the ringsshownA in Figure 3, but not as desirable otherwise.

Figure 7 illustrates a'ring of asimilar construction to that of Figure,which is not equipped with the raised base portion, but which is diestamped and has base apertures and stops provided as in the prevloustypes.

Assuming that the different parts of the pump are so constructed, andare assembled as described, in operation the rotor is driven in thedirection indicated by the arrow thereon in Figure 1, and as. the rotorblades move downwardly across the inlet opening 9, water will be drawnin by the vacuum pressure created within the expanding pockets betweenblades and will be carried by the blades forwardly to be discharged intothe outlet channel 10 and forced from the pump as the volume of thepockets is decreased.

Since the rings 16 rotate with the rotor but eccentrically thereof, theblades are moved into 'and from the rotor slots to maintain theirrelation with the casing and to prevent any backtlow of water. Byproviding that the rings 16 turn with the rotor, wear on the lugs 14 ofthe blades is reduced to a minimum and the pressure exertedfto actuatethe same vis distributed over the entire wall surfaces of the ringmembers, reducing wear at any one point to a minimum, and placing whatwear there is on parts that can be replaced without muc-h trouble orexpense.

Having thus described my invent-ion, what I claim as new therein anddesire to secure by Letters Patent, is:

In a. pump of the character described, a cylindrical casing having inletand outlet ports therein, plates enclosing the ends of said .casing andhaving annular grooves therein concentric with the casing, bushing ringsiittedwithin the said grooves having annular outwardly facing channelsin their base portions, balancing rings mounted to revolve in saidgrooves within said bushings and having annular grooves therein andhaving openings through the bases of said grooves movable inregistration with the channels of said bushings, a shaft?,` mountedmembers Within said latter grooves engagerevolubly in said end plates toextend eccenable by lugs of said blades to cause rotation tricallythrough the casing, a rotor keyed on of the vrings with the rotor. 10said shaft, a plurality of radial slots formed Signed at Seattle,Washington, this 26th in said rotor, blades slidably mounteduin said dayof October, 1920.

slots having lugs at their ends extending into .the grooves of saidbalancing rings and stop v WALTER J, PllAT'll.

